Insulator.



H. R. MARKEL.

INSULATOR. APPLICATION FILED JULY 1, 1910.

992,570, Patented May16,1911.

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' To all whom it may concern:

I particularly to that type of electrical insulator shown in my priorPatent 8-7 8,302, dated- February 4th, 1908, in which the insulatorisformed of two sections of porcelain or similar material, said sectionsbeing secured together by ascrew. or other fastening device, which alsoserves to secure the insulator body to a part of a buildingcr othersupport.

The object oft 'he present invention is to provide a two-part insulatorof improved construction, to soconstruct the sections or members thatthey will efficiently grasp the electrical conductors to be supportedthereby, and to so construct them that they will not possess undmirableprojections.

Further objects .and advantages of themvention will be set forth in thedetailed description whichnow followsz In the accompanying drawing,Figure 1 is a vertical section of an insulator constru'ctedin accordancewith the invention,

Fig. 2 is a perspective view of one of the members thereof, and, Fig. '3is a plan view of oneof said members, illustrating a slightly modifiedform of retaining groove. Like numerals designate corresponding partsin. all of the figures of the drawing.

Referring to the drawing, the numerals 5'and 6 designate a pair ofsubstantially L- shaped sections, the ends of each of the longerportions" of saidsections bemg provided with grooves"? and 8 adapted toregister when said sections are brought together face to face with thegrooves 9 and 10, formed in the inner faces of the short portions f saidsect ons, said grooves servlng to receive the electrical conductors12which are supported by the insulator. A passageway 13 is formed partlyin the section 5 and partly in the section 6, it being understood that ascrewnor other. fastening device may be passed through said passagewayin either direction ,to therebysecure the insulator to ianydesired partof a-building or other suppo The-' form of the invention lllustrated 1nexactly like that illustrated in Figs. and 2 except-that the grooves .8and 9 TED STAWENT HARLEY a. MARKEL, or COLUMBUS, orno, Insura'ron.

Specification of Letters Patent.

Application filed July 1, 1910. Serial No. 569,912,

Patna-my a11- formed in a section 6 are notched'ficor ase-rs rated tomore securely graspfthe cnductors l2. I i x From the.foregoingdescription tavi l l be seen that the insulator hereinwsiowneanddescribed comprises tworidentically'formed sections, either of which isiadapte d to form the upper or lower 'meniber-"'of' 'theicompletedinsulator. It. will z-furthermore be seen that the placingin'po'sitionrof theascrew that secures the insulator in place, serves tobind the two sections of the insulator into permanent engagementwitheachother.

There are several reasons why an insulator of this character possessesimportant advantages over the insulator shown in my prior patent and'over-otherstructures along the same 'line. In the first. place, theinsulator herein shown and, described may be very'economicallymanufactured. v.The'se in.-

sulators are formed with dies. The fewer.

- each other so that a die with a number of projections and depressionswill not wear nearly so long as one having the plain flat surfacenecessary in making the insulator" herein shown and described.Furthermore,-

an insulator having a number of projections is very often broken inshipment. In ship-' ping these insulators, they are thrown loosely inbarrels, sometimes with a. small amount of excelsior or shavings; Sincethese barrels receive very rough handling in transit any insulatorhaving a number of fragileprojections is likely to be broken. This isnot so however, with an insulator constructed with smooth faces andheavily made, as is the present device. The vertical, flat, inside face14 is desirable for several reasons. First, the top section of theinsulator co'mes-vertically down upon the bottom section thereof. This'ren-- ders it easy to insert and drive home the fastening device,whether such fastening device be a nail, screw, or bolt. Furthermore, inpressing out the insulator in thecourse of manufacture, a more evenpressure may be applied than is possible with a number of depressionsand slanting faces. It is quite necessary that the insulators all havethe same pressure applied .in molding, since if too great a pressure isapplied they go to pieces under strain of expansion in the kiln and ifnot enough pressure, they; come from the kiln too porous to be ofservice.

It is to be understood that the invention'is not limited to the vpreciseconstruction set forth, but includes Within its purview such changes asmay be made Within the scope of the appended claims. l

Having described my invention, What I claim is:

1. An insulator comprising two identical L-shaped sections, the centralmeeting Walls thereof beingfiat and Vertical, and the horizontal meetingWalls thereof having transverse registering grooves formed therein.

2. An insulator comprising two identical L-shaped sections, the centralmeeting Walls thereof being flat andv vertical, and the horizontalmeeting walls thereof having transverse registering grooves formedtherein,

there being a central passageway formed through said insulator whichlies partly in one of said sections and partly in the other.

8. An insulator comprising two identical L-shaped sections, the centralmeeting Walls thereof being fiat and vertical, and the horizontalmeeting Walls thereof having transverse registering grooves formedtherein, there being a central passage-way formed through said insulatorwhich lies partly in one of said sections and partly in the other, saidgrooves havlng serrated Walls.

In'testimony whereof I aflix my signature in presence of two witnesses.

HARLEY R. MARKEL. \Vitnesses: R. B. CAVA'NAGH, J. P.' EAGLESON.

